This data (click the image to see more routes) is a tad dated but I think everyone will enjoy taking a look and seeing how their favorite routes stack up.
Back when I wrote at Orphanroad.com I did a series with some similar ridership data (Part 1, Part 2). I didn’t directly compare the ridership figures because they aren’t directly comparable, so cross your eyes a bit if you want to compare them. I have only included routes with more than 1,000 daily riders. Also note that these figures are not direct measures and created using sampling and some fancy statistics.
The next shakeup should complete the most significant change Seattle’s transit system has seen in many years and it will be interesting to see how it impacts ridership on specific routes. At first blush I would expect the 8 to gain a good amount of ridership. It is becoming a center city version of the 44 and 48. And can’t the the 48 get any love… or Rapidride branding, TSP, off-board fare payment and maybe some real-time information?